Haier MRV II Instruction Manual page 120

[30] high pressure switch circuit
if high pressure switch acts
yes
if high pressure switch
is normal
yes
if stop valve opens
yes
if in cooling outdoor
fan motor runs normally
yes
if the heat exchanger
is clogged or the air flow is
in short circuit
no
if SV3 bypass
circuit is normal
yes
A
no
no
if the wi ring is normal
yes
no
if the connector,
fan motor are normal
yes
if the high pressure
sensor is in back up runn ing
no
no
if the high pressure
sensor is normal
yes
check if outdoor connecting
board is faulty, if yes, replace it
- 120 -
check and replace if faulty
no
check and rewiring if faulty
no
if service valve opens fully
no
modify
no
eliminate the abnormal reaso ns
yes
replace high pressure sensor
modity the SV3 bypass circuit
no
replace high pressure sensor
Part 3